Dend. parishii

[Chiral224]

Hi all,

I bought my first dend. about a month ago. He told me it was blooming size, but...its really really small! I'm also concerned that the tops of the leaves are brownish-red...is that normal? or something with its growing conditions? Its in a large east window, potted in a fern bark mix and fertilized weekly (and weakly) with dynagro 'grow'.
Is this guy going to get any bigger? and have i already killed it???